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M. STHR sTovE' Filed July 27, 192s 5 sheets-sheet 4 Patented Dee. 9,192A,

htiitti UNITED STATES PATENT OFFICE.

MROSLAV STHR, 0F :PRAGUE CZECHOSLOVAKIA.

Application led July 27, 1923.

To all whom t may concern.'

Be it known that I, Mmosnav STHP., a citizen of the Republic ofCzechoslovakia, residing at Prague, Czechoslovakia. have inventedcertain new and useful lmprovements in Stoves, of which the following isa specification.

My invention `relates to a slow combustion stove in which the admissionof the combustion air, the admission of additional air, as well as theescape of the smoke can be regulated by means of a single device so asto obtain the desired degree of heating. The invention also relates to aregulating device comprising a drum subdivided into three chambers andprovided with slots and a spindle provided with dampers and passingthrough the centre 0f the said drum.

More particularly, the regulatingdevice is a slotted drum divided intothree cylindrical chambers, a damper being provided in each chamber. Thesupply of air is controlled by the damper in the central chamber and thedischarge of gases by the dampers in the side chambers. Both thelast-mentioned dampers are set at the same angle relatively to thedamper in the central chamber and all the dampers are carried on acommon spindle rotatably journalled in the drum. A space at the back ofa gasifying chamber disposed above the furnace and adjacent to thefilling opening is likewise divided into three cham,- bers. The centralone of these chambers is in direct communication with the furnace andconnected to thel air supply through the central chamber of the saiddrum, while the side chambers of the drum which are closed directly tothe furnace may be placed in communication either with the furnace orwith the flues leading to the chimney through the regulating drum.

A construction of the sto-ve according to my invention isdiagrammatically shown, by way of example, in the accompanying drawings,in which Fig. l is a vertical section of the stove through the centralchamber of the regulating drum; Figs. 2 to 4e are fragmental similarsections with the regulating dampers in different positions; Fig. 5 is ahorizontal section on line BWB in Fig. l; Fig. 6 is a horizontal sectionon line A-A in Fig. l; Fig. 7 is a vertical section on line CC of Fig.6; Fig. 8 is a front elevation of the handle for operating theregulating dampers; Fig. 9 isa horizontal section on line D-D in Fig. 7Fig. 10 is a plan of part STOVE.

serial No. 654,107.

of the stove; Fig. ll is a vertical section on line E-E in Fig. l2 whichis a horizontal section on line F-F in ll; Figs. lf2 and lal to 4ta arevertical longitudinal sections of the stove through the side chambers ofthe regulating device; Figs. lll and l5 are views of the regulatingdevice from two opposite sides; Figs. 16 and 1T show a perspective viewof the regulating drum seen from two different sides; and Fig. 18 is aperspective View of the spindle with its dampers provided in theregulating drum.

The combustion chamber' and a gasifying chamber g both having perforatedwalls, are disposed above the grate R and are separated from each otherby a narrow space S. ritrches le provided between the casing of thestove and the lower portion of the gasifying chamber g divide lthe airentering the gasifying chamber from the front.

The gasifying chamber g is in direct communication with the flue 30, theupper portion of the wall of which is perforated. Duets 26 are providedbetween the outer face of the said flue and the casing of the stove, thesaid ducts opening into the ante-chamber of the gasifying chamber g. Thespace between lthe back portion of the gasifying chamber g and thecasing of the stove is divide-d into three chambers by angularIintermediate partitions 31 (Fig. 1l). The central chamber 4 is in directcommunication with the Yfurnace f through a 'passage 3 (Figs. l and ll).The side chamber 7 arc closed against the furnace f by the saidintermediate partitions at the level of the upper edge of the saidfurnace.

The casing of the stove is divided into chambers and is arranged asfollows:

Lower conduits 6 are disposed symmetrically to the centre (Figs. 11 andl2) and are closed against the ash-pit 32 by partitio-ns 33'. Lateralvertical conduits 6b which extend partially over the front of thelcasing of the stove passing in front of the gasifying chamber g openinto the said conduits 6"L into which likewise open conduits G providedon the back of the casing of the stove and leadingV to a horizontalcylindrical casing 34 in communication with an uptake 10 connected tothe chimney. The furnace gases thus flow through the said conduits (i,6a and 6b.

Rear ducts 2O and front ducts l5 are provided at the corners of thestove and are in communication with the surrounding air throughapertures cut in the casingv of the stove and extending almost to thefloor of the latter, so that the said surrounding air has access to theinterior of the casing of the stove. rllhese ducts 2() and 15 open intoa chamber 23 surrounding the gasedischarging ducts 26 of the lillingopening. rllhe 'top ol:I the chamber A3 is provided With tubes 2liestablishing communication between the chamber 23 and a chamber 25immediately above the latter. The chamber 25 is filled with Water and iseither in direct communication With the surrounding air through openingsin the casing or is provided with a discharge conduit 22.

Atmospheric air has also access to the above-mentioned ducts 29 througha chamber 18 provided on the rear and central lower portion of thecasing of the stove (Fig. 1). This chamber 18 is in communication Withatmospheric air through a conduit 1i' and has on both sides conduits 19leading to the ducts 20. A. passage opens into the cover of the chamber18 and also leads to a central slot in the cylindrical casing 34 whichcontains a drum fr (Figs. 16 and 17) closed at each end at 3G and havingintermediate partitions 37 whereby the drum is divided into a centralchamber 38 and tvvo side chambers 39 respectively. The drum r is axiallytraversed by a rotatably journalled spindle t() carrying a damper o inthe chamber 38 and a damper 7e in each of the chambers 39, the dampers7e being arranged to both form the same angle with the central damper o.The spindle 10 projects externally from the casing 34 and may be rotatedby means of a handle l1 for the purpose of setting the dampers invarious positions.

The division of the drum r into the chambers 38 and 39 corresponds tothe arrangement of the chambers 4 and i' at the back of the gasifyingchamber g. The Wall oi the drum r has suitable slots adapted tocooperate with apertures in the casing 34; in which the drum is mounted.

Referring to Fig. Ll, the portion of the Wall of the drum r facing theinterior of the stove has a slot 2 ccupying the Width of the centralchamber 38 of the drum r and lying below a horizontal plane passingthrough the axis of the drum, Each of the side chambers 39 of the drumhas a similar slot 5. Further slots 8 are provided on the Wall of thechambers 39 above the said central plane and above the slots 5, so thatfree passage is afforded through the slots 5, the chambers 39 and theslots 8 when the dampers lc are in the correct position.

Referring to Figs. 15, 16 and 17. the rear Wall of the regulating drum7^- has slots 1a, 1b, 1c 'occupying the Width of the central chamber 38and lying below the above-mentioned central plane. Each of the chambers39 has similar slots 9 and 11, the slots 11 extending somewhat above thesaid eentral plane. Finally, a further slot 1Q, orenpying the width oi"the chamber 38, is po itioned above the slots 1, 1b and l and ahnte thesaid central plane oii` the drum fr.

rilhe essential point is that the combustion air should pass directlyonly into the loner portion of the furnace chamber f, and the spreadingof the air tfiiwards the upper para of the store gasii'ying chamber g bebrouglu about by the draft of the chimney.

Accordingly each ot the chan'ihers nl the drum fr and all these chambersare simnlta neonsly regulated as regards their relation to the storechambers and ilues by means nl' the dampers o which can be rotated withthe spindle lO in any direction.

The heating` and ventilation oi the room are regulated in the followingmanner:

lilith the regulation effected in accordance with F 1 and 1?. theincoming air passes through the slots 1nu and 1b into the centralchamber 38 of the regulatng drum r below the damper e' whence the airpasses onlyv through the slot Q owing to the position oi the damper o,and reaches the lower portion of the furnace chamber 7.

The air passes also through the passage I) into the chamber l in whichit is heated and thence into the gasiitying chamber (f7 where it becomesmixed with the combustion gases and causes them to burn completely. The,chimney draft acts on the lfurnace and gasifying chamber of the stovethrough the uptake 10. the slots 9 in the chambers 39 ot the regulatingdrinn fr, the drinn itself and its slots 8. lhen necessaryn andaceoixliiuxto the position ot the dampers Z1. the air can also be causedto pass from the ante-chainber of the furnace chamber f. through theslots 5. 11. side chambers 39 ot the regulating drum r. the conduits C,the lower conduits GfL adjoining the latter. then through the lateralvertical conduits tl" into the anti chamber et the gasifying chaml'ierlo the gasifying chamber after being heated in the inner lines.Accordingly. the combustion air spreads over the `rhole upper part ofthe gasifying chambers The combustion gases Which rise in the iurnacechamber and in the gasitying chamber, in as far as theyT are notcompletely burnt by the supply of heated combustion air, collect withthe smoke and other material in the side chambers 7 and pass through theslots 8, the regulating drum r and its slots 9. into the uptake 10. Thegases generated in the {illing chamber above the gasiiying chamber. passthrough the openings of the filling duct into the conduits 26 arrangedround the .filling` duct and opening into the anteclia1nber of thegasifying chamber' o (Figs. 1 and 1"l It after this setting of elementswhich is done to start or light the stove. the fire is to burnconstantly at a high rate, the regulating Laisser dampers 7c, o areturned into the position shown in Figs. 2, 2 and i5. rThe path 'for theadmission oi air and the action or' the said air remains the saine. @nthe contrary, the furnace chamber is connected directly through theslots 5 anc 8 ot' the regulating drum with the chambers 7 in which gasescollected in the previous position ot the said drum, so that the heatedcornbustion air escaping troni the chamber i", together with the airalso heated which escapes in the same direction from the chamber d,cause a complete combustion oit the combustion gases in the whole or thegasi'tying chamber y. The discharge ot the combustion into the chin'ineytakes place however exclusively through the ilues 6b, G, 6 (Fig. lf3) aswell as through the side chambers 239 oi' the drum r, provided with theslots ll and 9, whereby a considerable heating of the door is produced.

The action or the ifurnace, with the dan'ipers 7c, c in the positionshown in l and 3", is reduced while the quantity of the air supplied ishalved. The excess oit air passes directly into the chimney through theslot l", the regulating drum r and slot l2 so that the whole room isventilated. rlfhe discharge 'or the combustion gases remains the same.

lWith the damper-s 7c, 'u in the position shown in lFigs. 4 and 4L, theadmission of air is completely shut ori. The ventilation of the room isconsiderably increased by the air current through the slots l", l, 12.rEhe discharge oit the combustion gases from the stove, reduced to aminimum by the ventilating current ot air, as well as the discharge o'tthe secondary air from the ante-chamber of the furnace f and chamber 4i,into the uptalre 10 which is throttled takes place through the fines 6b,6, G and slots 11 and 9.

.ln that way, by turning the spindle i0 carrying the dainpers 7c, c inone or the other direction, it is always possible to ensure the desireddegree of heating.

ln order to bring about circulation, puriiication and moistening ot theair of the room, the air admitted passes through the conduits lC and 17,chamber i8, and ducts i ,i the room or may be conveyed elsewhere.

l claim as my invention:

l. :in a slow combustion stove, the combination with the turnaceandgasifying chamber and a casing enclosing the same, et a regulating drumhaving slotted walls and being divided into three chambers, the spacebetween the said gasifying chamber and the rear oit the said casingbeing likewise divided into three chambers, corresponding to thechambers in the said regulating drum, and means in the said. regulatingdrum for connecting the central chamber of lthe said space directly tothe said furnace chamber, and the other chambers in the said spaceeither directly or indirectly to the said gasifying chamber torsupplying air to the said chambers.

2. rlhe combination as specilied in claim 1, in which the saidregulating drum coinprises a cylindrical casing provided with slots,arotatable spindle passing through the center ot the said casing andbeing journalled therein, and dampers carried by the said spindle, onedamper in each chamber, the dampers in the two outer chambers of thesaid casing being offset at the saine angle rela-tive to the damper inthe central chamber of the said casing.

ln testimony whereof I have signed my naine to this specication 1n thepresence of two subscribing Witnesses.

Minosrav sror-rn.

lWitnesses Dr. ZUG. Errors KAsoI-rrorsnr, KARL LUHA.

